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• W48431394 abstract "This chapter considers turbulent flows in which the reactants have been fully mixed prior to reaction. Application to combustion is emphasized both because many practical combustion systems require the fuel and oxidizer to be premixed, and also because the premixed flame provides a convenient test for contemporary ideas about turbulent reacting flows. Only gaseous species are considered. The rates of the chemical kinetic processes leading to combustion are strongly dependent on temperature. Consequently, the propagation of a premixed laminar flame requires thermal conduction and diffusion from the hot products to preheat the reactive mixture. In a turbulent flame, these molecular processes are augmented both indirectly, by distortion of flame surfaces, leading to an increase in their area, and directly, by turbulent mixing. The result is that the mean rate of heat release is generally more strongly influenced by the turbulence than by chemical kinetic factors so that premixed turbulent combustion is primarily a complex fluid mechanical problem. However, ignition and flame quenching provide examples of situations in which both chemical kinetics and fluid mechanics are likely to be important. Premixing leads to a significant simplification in the analysis as the composition of the flow is essentially uniform, in terms of the elements involved, i.e., the Z[s of (1.19) are constants. It also causes complications; the scalar thermodynamic variables of temperature, density, and composition often fluctuate strongly within this type of flame, between values characteristic of the unburned and fully burned mixtures. These intense scalar fluctuations pose theoretical and experimental difficulties, some of which have not yet been solved. Following a review of knowledge concerning premixed turbulent combustion, this chapter concentrates on theoretical models which are based on prior specification of a probability density function for the fluctuating thermodynamic state of the mixture. It is argued that such models provide the best available compromise between complexity and generality of application." @default.
• W48431394 created "2016-06-24" @default.
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• W48431394 date "1980-01-01" @default.
• W48431394 modified "2023-09-26" @default.
• W48431394 title "Turbulent flows with premixed reactants" @default.
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• W48431394 doi "https://doi.org/10.1007/3540101926_10" @default.
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